CN115974515A - Fluid solidified soil based on cohesive soil and preparation method thereof - Google Patents
Fluid solidified soil based on cohesive soil and preparation method thereof Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 178
- 239000012530 fluid Substances 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 81
- 239000000463 material Substances 0.000 claims abstract description 45
- 239000002131 composite material Substances 0.000 claims abstract description 40
- 239000004568 cement Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 18
- 241001646828 Platostoma chinense Species 0.000 claims abstract description 15
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 14
- 239000010440 gypsum Substances 0.000 claims abstract description 14
- 239000006227 byproduct Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 239000004927 clay Substances 0.000 claims description 25
- 239000002002 slurry Substances 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 13
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 6
- 239000002245 particle Substances 0.000 abstract description 11
- 239000002270 dispersing agent Substances 0.000 abstract description 5
- 239000000945 filler Substances 0.000 abstract description 4
- 238000009775 high-speed stirring Methods 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 239000000203 mixture Substances 0.000 description 12
- 238000010276 construction Methods 0.000 description 7
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- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 241000234276 Curculigo Species 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000005056 compaction Methods 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- MOMKYJPSVWEWPM-UHFFFAOYSA-N 4-(chloromethyl)-2-(4-methylphenyl)-1,3-thiazole Chemical compound C1=CC(C)=CC=C1C1=NC(CCl)=CS1 MOMKYJPSVWEWPM-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
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- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
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- 235000019983 sodium metaphosphate Nutrition 0.000 description 1
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 description 1
- 229940039790 sodium oxalate Drugs 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention belongs to the technical field of civil engineering materials, and discloses a fluid-state solidified soil based on cohesive soil and a preparation method thereof. The fluid solidified soil comprises the following components in parts by mass: 80-90 parts of cohesive soil, 10-20 parts of composite curing material and 0.08-0.48 part of American Mesona chinensis Benth, and the water-cement ratio is 0.4-0.8. The invention utilizes the composite curing material consisting of cement and industrial by-product gypsum and the American Mesona chinensis Benth as a dispersing agent, and is matched with the improvement of stirring equipment, under the conditions of no addition of particle fillers and no need of high-speed stirring, the problems of insufficient fluidity and age strength in the process of preparing the fluid state curing soil by using the cohesive soil are solved, the preparation of the fluid state curing soil based on the cohesive soil is realized, and the technology is an efficient, economic and stable technology for preparing the fluid state curing soil of the cohesive soil.
Description
Technical Field
The invention belongs to the technical field of civil engineering materials, and particularly relates to flow-state solidified soil based on cohesive soil and a preparation method thereof.
Background
The sandy soil-based fluid solidified soil is widely applied to the engineering fields of foundation pits, underground pipelines, underground pipe gallery backfilling, airport filling and the like. And the cohesive soil is limited in application to engineering because self-compaction fluid state solidified soil meeting the requirement of fluidity is difficult to obtain. The obtained flow state solidified soil based on the cohesive soil meeting the fluidity requirement has very important significance for the recovery and treatment of a large amount of cohesive soil waste soil formed in urban engineering construction.
Chinese patent CN114753346A discloses a method for preparing ready-mixed fluid-state solidified soil by using in-situ silt clayey soil, which realizes the preparation of fluid-state solidified soil by adding a composite clay dispersant and a composite soft soil curing agent into silt clayey soil, but the composite clay dispersant is compounded by sodium metaphosphate, sodium oxalate, sodium hydroxide and sodium silicate as main raw materials, the preparation process is complicated, and meanwhile, a particle filler needs to be added to improve the particle grading of in-situ soil, so as to further improve the fluidity of the solidified soil, the quality of the fluid-state solidified soil is greatly influenced by soil property difference, the preparation process of the fluid-state soil is complicated, the preparation cost is high, and the fluidity and quality are unstable.
Chinese patent CN112030940B discloses a construction process of a marine soft soil curing agent and an in-situ ready-mixed cement soil cast-in-place pile, which requires adding a particle mixture meeting a certain gradation into marine silt soft soil to improve the fluidity of fluid-state cured soil, and the curing agent is prepared from slag, cement, fly ash, an alkaline trigger, a water reducing agent, a retarder and an expanding agent, and has complex components; the whole process flow comprises the following steps: the preparation of quasi-fluid-state mixed soil, the preparation of curing agent slurry, the preparation and the transportation of fluid-state mixture need to add water twice, the process is complex, and the preparation of fluid-state solidified soil can be realized only by a plurality of stirring flows, and the fluid-state solidified soil is unstable and is not beneficial to the popularization and the application of the fluid-state solidified soil.
Chinese patent CN111908855B discloses a composite pile premixed fluid-state solidified soil slurry and a preparation method thereof, clay is used as a main raw material, and the purpose of improving the fluidity of the fluid-state solidified soil can be achieved only by adding a certain weight of fine sand into the clay and improving the gradation of the clay, so that the complexity of the raw material and the preparation process is increased. In general, the key problems in the manufacture of the fluid solidified soil based on the cohesive soil are to improve the fluidity and ensure the age strength of the fluid solidified soil, and an efficient, economic and stable technique for preparing the fluid solidified soil based on the cohesive soil is urgently needed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a flow state solidified soil based on cohesive soil and a preparation method thereof aiming at the defects in the prior art, a composite solidified material consisting of cement and industrial by-product gypsum and American Mesona chinensis water are used as a dispersing agent, and the problems of fluidity and age strength existing in the flow state solidified soil prepared from the cohesive soil are solved under the conditions of no addition of particle fillers and no need of high-speed stirring by matching with the improvement of stirring equipment.
In order to solve the technical problems provided by the invention, the invention provides a fluid solidified soil based on cohesive soil, which comprises the following components in parts by mass: 80-90 parts of cohesive soil, 10-20 parts of composite curing material and 0.08-0.48 part of American Mesona chinensis Benth, and the water-cement ratio is 0.4-0.8.
In the scheme, the clay is clay or silty clay.
In the scheme, the composite curing material consists of cement and industrial by-product gypsum.
In the scheme, the composite curing material comprises the following components in percentage by mass: 60-70% of cement and 30-40% of industrial by-product gypsum.
Further, the industrial byproduct gypsum is desulfurized gypsum or phosphogypsum.
In the scheme, the American Mesona chinensis Benth is U-6 type.
Preferably, the mass of the composite solidified material is 16-20% of the mass of the cohesive soil.
Preferably, the mass of the Mesona chinensis Benth is 0.3-0.4% of that of the cohesive soil.
The invention also provides a preparation method of the fluid solidified soil based on the cohesive soil, which comprises the following steps:
1) Adding the cohesive soil into stirring equipment for preliminary stirring and dispersing;
2) Fully mixing the composite curing material with water to form composite curing material slurry;
3) Adding the composite solidified material slurry into stirring equipment, and fully stirring and mixing the composite solidified material slurry and the cohesive soil to form primary non-fluidized solidified soil;
4) And adjusting the pH value of the preliminary non-fluid solidified soil, adding the American water for storage, and continuously stirring and mixing until the solidified soil is not adhered to the stirring blades and does not generate bubbles any more, so as to obtain the fluid solidified soil based on the cohesive soil.
In the scheme, in the step 2), the water consumption is determined according to the water-cement ratio, and the water consumption involved in regulating the water-cement ratio comprises water introduced into the cohesive soil.
In the scheme, in the step 4), the pH value is adjusted to 6.3-7.3.
In the scheme, the stirring device is internally and coaxially provided with the main blade and the auxiliary blade, the stirring radius of the main blade is smaller than that of the auxiliary blade, and the main blade and the auxiliary blade can stir simultaneously or not.
Further, in the step 3), a mother blade is adopted for stirring, the stirring speed is 20-40r/min, and the stirring time is 5-8min.
Further, in the step 4), the primary blade is started to stir, when the solidified soil is adhered to the boundary of the stirring equipment, the secondary blade is started to stir to separate the adhered solidified soil, then the primary blade is started to continue stirring, and the steps are repeated; the stirring speed of the mother blade is 60-80r/min, and the stirring speed of the son blade is 20-30r/min.
Compared with the prior art, the invention has the following beneficial effects:
1) The invention adopts a composite curing material consisting of cement and industrial by-product gypsum and American Mesona chinensis Benth as a dispersing agent to prepare the fluid curing soil based on cohesive soil; the composite curing material is simple in component, the consumption of cement is reduced by adopting industrial byproduct gypsum, the damage of early stage cement hydration to the fluidity of the fluid curing soil is reduced, the fluidity of the curing soil is enhanced by sacrificing early stage strength of the curing soil, and the later stage strength is not influenced; the American water for the land is characterized in that the surplus binding water in the saturated cohesive soil is released, so that the viscosity of the material formed by mixing the cohesive soil and the cement gypsum is reduced, the surface of solid particles is quickly wetted, the particle wettability, the suspension stability and the slurry rheological property of the slurry are effectively improved, and the dispersion of the fluidized solidified soil is realized; the release of the combined water in the cohesive soil not only reduces the using amount of water, but also reduces the porosity of the fluid-state solidified soil, thereby greatly improving the age strength of the solidified soil under the condition of less solidified materials and realizing the self-compaction of the fluid-state solidified soil; therefore, the contradiction between the fluidity and the age strength is solved, and the fluid-state solidified soil with different age strength and fluidity requirements can be prepared according to engineering requirements.
2) Compared with other fluid state solidified soil preparation processes, the preparation method has no special requirements on the particle composition of the cohesive soil, does not need pretreatment such as drying, grinding, screening and the like on the cohesive soil, can solve the problem of fluidity without adding particle fillers meeting certain composition in the preparation process, and has simpler process flow and greatly reduced construction cost.
3) The invention improves the stirring equipment, adopts the primary and secondary blades with different stirring radiuses, solves the problems of bottom sinking and wall sticking in the preparation process of the fluid solidified soil, can realize the low-speed stirring and the preparation of the fluid solidified soil under the condition of shorter stirring time, reduces the energy consumption in the preparation project of the fluid solidified soil, and simultaneously greatly reduces the requirements of the technical parameters of the construction equipment.
Drawings
FIG. 1 is a schematic view of the structure of a stirring apparatus used in the example of the present invention.
In the figure: 1-material box, 2-material inlet, 3-material outlet, 4-motor, 5-transmission box, 6-external linkage shaft, 7-internal linkage shaft, 8-female blade and 9-sub blade.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
In the following examples, the schematic structure of the stirring apparatus used is shown in FIG. 1. The stirring equipment comprises a material box 1, and the material box 1 is provided with a feeding hole 2 and a discharging hole 3; the motor 4 is arranged outside the feed box 1, and the outer linkage shaft 6 and the inner linkage shaft 7 are arranged inside the feed box; the motor 4 is connected with an outer linkage shaft 6 and an inner linkage shaft 7 through a transmission case 5, a female blade 8 is arranged on the outer linkage shaft 6, and a sub-blade 9 is arranged on the inner linkage shaft 7; the inner linkage shaft 7 is arranged inside the outer linkage shaft 6, is coaxially arranged and is respectively connected with the transmission case 5, and the outer linkage shaft 6 or the inner linkage shaft 7 is selected to rotate according to requirements so as to drive the female blade 8 or the sub-blade 9 to rotate.
In the following examples, the fluidity of the fluid solidified soil is reflected by the extension degree, and the determination method is as follows: a cylinder with an opening at the upper part and the lower part, and 8cm in diameter and height is adopted, fluid solidified soil is poured into the cylinder, the cylinder is tamped and leveled, then the cylinder is lifted, the fluid solidified soil generates a collapse phenomenon, the minimum diameter and the maximum diameter of a collapsed body are measured, and the arithmetic mean value of the minimum diameter and the maximum diameter is the expansion degree.
In the following examples, the solidification strength of fluid solidified soil is represented by unconfined compressive strength, and the determination method is as follows: selecting a cube test mold with the size of 70.5mm multiplied by 70.5mm, pouring the test mold by using fluid solidified soil, demolding after 48 hours, putting into a standard curing room with the temperature of 20 +/-2 ℃ and the relative humidity of more than 95 percent for curing for 7d, 14d, 28d and 60d, and testing the compressive strength of the test piece by using a non-confined uniaxial press machine.
In the following examples, clay and silty clay are used, the basic properties of the clay being a plasticity index > 17; the basic property of the silty clay is that the plasticity index is between 10 and 17.
In the following examples, desulfurized gypsum employed was derived from the byproduct of the FGD process, which is CaSO 4 ·2H 2 The content of O is more than or equal to 90 percent, the particle size is 30-100 mu m, and the content of free water is about 10 percent; the adopted phosphogypsum is derived from solid waste generated in a wet-process phosphoric acid process, the particle size of the phosphogypsum is 5-50 mu m, the content of crystal water is 20-25%, the phosphogypsum mainly comprises calcium sulfate dihydrate, and also contains a small amount of phosphorus, fluorine, organic matters, oxides, a small amount of heavy metals, radioactive substances and other impurities.
In the following examples, the American Mesona chinensis Benth used is "U-6"; the adopted cement is ordinary portland cement.
Examples 1 to 4
The components of the clay-based fluid clay-based solidification soils of examples 1-4 are shown in Table 1. In the compositions of examples 1 to 4, the mass of the composite curing material was 14%, 16%, 20% and 22% of the mass of the clay, and the mass of the Curculigo water was 0.2%, 0.3%, 0.4% and 0.5% of the mass of the clay, respectively.
The preparation method of the fluid solidified soil based on the cohesive soil in the embodiments 1 to 4 specifically comprises the following steps:
1) Adding the cohesive soil into stirring equipment for preliminary stirring and dispersing;
2) Fully mixing the composite curing material with water to form composite curing material slurry; the water consumption is determined according to the water-cement ratio, and the water consumption involved in regulating the water-cement ratio comprises water introduced into cohesive soil;
3) Adding the composite solidified material slurry into stirring equipment, and stirring by using a mother blade to fully stir and mix the composite solidified material slurry with the cohesive soil to form primary non-fluidized solidified soil;
4) Adopting sodium hydroxide and sodium bicarbonate to adjust the pH value of the primary non-fluid solidified soil, adding the American Mesona chinensis water, continuously stirring and mixing, starting the mother blade to stir during stirring, starting the son blade to stir to separate the adhered solidified soil when the solidified soil is adhered to the boundary of stirring equipment, starting the mother blade to continuously stir, repeating the steps until the solidified soil is not adhered to the stirring blade and does not generate bubbles, and obtaining the fluid solidified soil based on the cohesive soil. The key parameters of the preparation process are shown in Table 2.
TABLE 1
TABLE 2
The 4 groups of fluid solidified soil were tested for the extension degree and the unconfined compressive strength of 7d, 14d, 28d and 60d, and the results are shown in Table 3. The expansion degree is 175-184mm, which indicates that the fluidity and the pourability of the fluid solidified soil are good, and the construction is facilitated. The 7d unconfined compressive strength is 0.22-0.25MPa, the 14d-60d unconfined compressive strength is greatly improved, and particularly the 60d unconfined compressive strength can reach more than 4MPa, because the fluidity of the fluid solidified soil is enhanced by sacrificing the early strength of the solidified soil, but the later strength is not negatively influenced.
TABLE 3
Examples 5 to 8
The compositions of the clay-based fluid clay-type consolidated soils of examples 5-8 are shown in Table 4. In the compositions of examples 5 to 8, the mass of the composite curing material was 14%, 16%, 20% and 22% of the mass of the clay, and the mass of the Curculigo water was 0.2%, 0.3%, 0.4% and 0.5% of the mass of the clay, respectively.
The preparation method of the fluid solidified soil based on the cohesive soil in the embodiments 5 to 8 specifically includes the following steps:
1) Adding the cohesive soil into stirring equipment for preliminary stirring and dispersing;
2) Fully mixing the composite curing material with water to form composite curing material slurry; the water consumption is determined according to the water-cement ratio, and the water consumption involved in regulating the water-cement ratio comprises water introduced into cohesive soil;
3) Adding the composite solidified material slurry into stirring equipment, and stirring by adopting a mother blade to fully stir and mix the composite solidified material slurry with the cohesive soil to form primary non-fluidized solidified soil;
4) Adjusting the pH value of the preliminary non-fluid solidified soil by adopting sodium hydroxide and sodium bicarbonate, adding the American Mesona chinensis water, continuously stirring and mixing, starting the mother blade to stir during stirring, when the solidified soil is adhered to the boundary of stirring equipment, starting the son blade to stir so as to separate the adhered solidified soil, starting the mother blade to continue stirring, repeating the steps until the solidified soil is not adhered to the stirring blade any more and does not generate bubbles any more, and obtaining the fluid solidified soil based on the cohesive soil. The key parameters of the preparation process are shown in Table 5.
TABLE 4
TABLE 5
The 4 groups of fluid solidified soil were tested for the extension degree and the unconfined compressive strengths of 7d, 14d, 28d and 60d, and the results are shown in Table 6. The expansion degree is between 172 and 180mm, which indicates that the fluidity and the pourability of the fluid solidified soil are good, and the construction is facilitated. The 7d unconfined compressive strength is 0.23-0.27MPa, the 14d-60d unconfined compressive strength is greatly improved, and particularly the 60d unconfined compressive strength can reach more than 4MPa, because the fluidity of the fluid solidified soil is enhanced by sacrificing the early strength of the solidified soil, but the later strength is not negatively influenced.
TABLE 6
Examples 9 to 12
The compositions of the clay-based fluid clay-based set soils of examples 9-12 are shown in Table 7. In the compositions of examples 9 to 12, the mass of the composite curing material was 14%, 16%, 20% and 22% of the mass of the clay, and the mass of the Curculigo water was 0.2%, 0.3%, 0.4% and 0.5% of the mass of the clay, respectively.
The method for preparing fluid solidified soil based on cohesive soil in examples 9 to 12 specifically includes the following steps:
1) Adding the cohesive soil into stirring equipment for preliminary stirring and dispersing;
2) Fully mixing the composite curing material with water to form composite curing material slurry; the water consumption is determined according to the water-cement ratio, and the water consumption related to the regulation of the water-cement ratio comprises water introduced into the cohesive soil;
3) Adding the composite solidified material slurry into stirring equipment, and stirring by adopting a mother blade to fully stir and mix the composite solidified material slurry with the cohesive soil to form primary non-fluidized solidified soil;
4) Adopting sodium hydroxide and sodium bicarbonate to adjust the pH value of the primary non-fluid solidified soil, adding the American Mesona chinensis water, continuously stirring and mixing, starting the mother blade to stir during stirring, starting the son blade to stir to separate the adhered solidified soil when the solidified soil is adhered to the boundary of stirring equipment, starting the mother blade to continuously stir, repeating the steps until the solidified soil is not adhered to the stirring blade and does not generate bubbles, and obtaining the fluid solidified soil based on the cohesive soil. The key parameters of the preparation process are shown in Table 8.
TABLE 7
TABLE 8
The 4 groups of fluid solidified soils were tested for their spreading degree and their unconfined compressive strengths of 7d, 14d, 28d and 60d, and the results are shown in Table 9. The expansion degree is 168-177mm, which shows that the fluidity and the pourability of the fluid solidified soil are good, and the construction is facilitated. The unconfined compressive strength of 7d is 0.24-0.28MPa, while the unconfined compressive strength of 14d-60d is greatly improved, particularly the unconfined compressive strength of 60d can reach more than 4MPa, because the fluidity of the fluid solidified soil is enhanced by sacrificing the early strength of the solidified soil, but the later strength is not adversely affected.
TABLE 9
The above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the present invention. Other variants and modifications of the invention, which are obvious to those skilled in the art and can be made on the basis of the above description, are not necessarily exhaustive of all embodiments, and are therefore intended to be within the scope of the invention.
Claims (10)
1. A flow state solidified soil based on cohesive soil is characterized by comprising the following components in parts by mass: 80-90 parts of cohesive soil, 10-20 parts of composite curing material and 0.08-0.48 part of American Mesona chinensis Benth, wherein the water-cement ratio is 0.4-0.8; the composite curing material consists of cement and industrial by-product gypsum.
2. The fluid solidified soil based on cohesive soil as claimed in claim 1, wherein the composite solidified material comprises the following components in percentage by mass: 60-70% of cement and 30-40% of industrial by-product gypsum.
3. The fluid solidified soil based on cohesive soil as claimed in claim 1, wherein the cohesive soil is clay or silty clay; the industrial byproduct gypsum is desulfurized gypsum or phosphogypsum.
4. The fluid solidified soil based on cohesive soil as claimed in claim 1, wherein the mass of the composite solidified material is 16-20% of the mass of the cohesive soil.
5. The fluid solidified soil based on cohesive soil as claimed in claim 1, wherein the Mesona chinensis Benth is "U-6" type; the mass of the American Mesona chinensis Benth is 0.3-0.4% of that of the cohesive soil.
6. The method for preparing the fluid solidified soil based on cohesive soil as claimed in any one of claims 1 to 5, comprising the steps of:
1) Adding the cohesive soil into stirring equipment for preliminary stirring and dispersing;
2) Fully mixing the composite curing material with water to form composite curing material slurry;
3) Adding the composite solidified material slurry into stirring equipment, and fully stirring and mixing the composite solidified material slurry and the cohesive soil to form primary non-fluidized solidified soil;
4) And adjusting the pH value of the primary non-fluid solidified soil, adding the American Mesona chinensis Benth, and continuously stirring and mixing until the solidified soil is not adhered to the stirring blade any more and does not generate bubbles any more, so as to obtain the fluid solidified soil based on the cohesive soil.
7. The method for preparing fluid solidified soil based on cohesive soil according to claim 6, wherein in the step 4), the pH value is adjusted to 6.3-7.3.
8. The method for preparing fluidized solidified soil based on cohesive soil according to claim 7, wherein a mother blade and a son blade are coaxially arranged in the stirring device, the stirring radius of the mother blade is smaller than that of the son blade, and the mother blade and the son blade are stirred simultaneously or non-simultaneously.
9. The method for preparing fluidized solidified soil based on cohesive soil according to claim 8, wherein in the step 3), a mother blade is used for stirring, the stirring speed is 20-40r/min, and the stirring time is 5-8min.
10. The method for preparing fluid solidified soil based on cohesive soil according to claim 8, wherein in the step 4), the primary blade is started to stir, when the solidified soil is adhered to the boundary of the stirring device, the secondary blade is started to stir so as to separate the adhered solidified soil, and then the primary blade is started to continue to stir, and the steps are repeated; in the step 4), the stirring speed of the mother blade is 60-80r/min, and the stirring speed of the son blade is 20-30r/min.
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| CN202310086612.6A CN115974515A (en) | 2023-02-09 | 2023-02-09 | Fluid solidified soil based on cohesive soil and preparation method thereof |
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| JPH10182212A (en) * | 1996-12-20 | 1998-07-07 | Ube Ind Ltd | Solidifying material for fluidized back filling and fluidization treated soil formed by using the same |
| CN205969487U (en) * | 2016-08-24 | 2017-02-22 | 浙江索纳塔建筑材料有限公司 | Concrete mixing shaft |
| CN111844434A (en) * | 2020-07-28 | 2020-10-30 | 深圳市市政工程总公司 | Method for preparing and stirring premixed fluid solidified soil |
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